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Custom_Response_Problems.tex
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Tue Jul 18 18:56:11 2006 UTC (18 years, 1 month ago) by
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attempting to possibly make the english clearer?
1: \label{Custom_Response_Problems}
2: Custom Response is a way to have a problem graded based on an algorithm. The use of this response type is
3: generally discouraged, since the responses will not be analyzable by the LON-CAPA statistics tools.
4:
5: The student answer is stored in the
6: variable \$submission, and needs to be evaluated by Perl code inside the <answer>-tag. Custom Response needs to return a standard LON-CAPA grading code:
7: \begin{itemize}
8: \item EXACT\_ANS: return if solved exactly correctly
9: \item APPROX\_ANS: return if solved approximately
10: \item INCORRECT: return if not correct, uses up a try
11: \item SIG\_FAIL, NO\_UNIT, ANS\_CNT\_NOT\_MATCH, BAD\_FORMULA,
12: WANTED\_NUMERIC: return if not correct for different reasons, does not use up a try
13: \end{itemize}
14: The answer display is shown instead of the student response in 'show answer' mode.
15: The following example illustrates this:
16: \begin{verbatim}
17: <problem>
18: <startouttext />Accept an answer of around 90 or -90<endouttext />
19: <customresponse answerdisplay="something near 90 or -90">
20: <answer type="loncapa/perl">
21: # We do not want a vector
22: if ($submission=~/\,/) { return 'ANS_CNT_NOT_MATCH'; }
23: # Need a numerical answer here
24: if ($submission!~/^[\d\.\-\e]+$/i) { return 'WANTED_NUMERIC'; }
25: $difference=abs(90-abs($submission));
26: if ($difference==0) { return 'EXACT_ANS'; }
27: if ($difference < 0.1) { return 'APPROX_ANS'; }
28: return 'INCORRECT';</answer>
29: <textline readonly="no" />
30: </customresponse>
31: </problem>
32: \end{verbatim}
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